<script>
	let todos = [
		{ done: false, text: 'finish Svelte tutorial' },
		{ done: false, text: 'build an app' },
		{ done: false, text: 'world domination' }
	];

	function add() {
		todos = todos.concat({ done: false, text: '' });
	}

	function clear() {
		todos = todos.filter((t) => !t.done);
	}

	$: remaining = todos.filter((t) => !t.done).length;
</script>

<h1>Todos</h1>

{#each todos as todo}
	<div class:done={todo.done}>
		<input type="checkbox" checked={todo.done} />

		<input placeholder="What needs to be done?" value={todo.text} />
	</div>
{/each}

<p>{remaining} remaining</p>

<button on:click={add}> Add new </button>

<button on:click={clear}> Clear completed </button>

<style>
	.done {
		opacity: 0.4;
	}
</style>
